Should just be 10.3 or 10.7 with maybe the magic 1. Gaijin wants it to be "special" since it's an event vehicle, so they just throw the magic 2 on it and call it a day.
I spaded it in 37 games with a 62% win rate with a 1:1 KDR. I was already used to top tier and have used magic 2 before so it wasn’t all that bad to play. To note I took advantage of the last task and ground out all but the tier 4 modules and used the reward to do those so that was 80k rp less I had to grind out
I won't mind losing Magic 2's in exchange for more suitable BR. It ain't funny to fly it against top tier without radar, speed or long reach. On its current BR, the Jag IS is limited to being a vulture - sneaking behind people and killing them while they are distracted. The moment something notices you, you're dead.